Comes with 8 "G" keys (programmable to whatever you want, macros, system functions, etc). You can program different lighting styles in the Logitech G Hub app.

One of these keys is broken (G2). All other keys are functional and do not double type. The volume adjuster wheel does not work on my computer, but I don't know if it is actually broken or just a compatability issue.

I have been using it for a few years, never had any issues.